Add extension function/event histogram presubmit checks back.
Add extension function/event histogram presubmit checks back.

I removed them to submit r336003 because they were preventing the CQ.

BUG=503402
R=rdevlin.cronin@chromium.org

Review URL: https://codereview.chromium.org/1203283002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#336024}

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